RESUMEN
This work is devoted to comparing the Monte Carlo simulation tools: Monte Carlo Calculation-Multi Track (MCC-MT) software and EffMaker software, in terms of the efficiency when using them in field applications for measurement of radioactive waste or their free release from control. The detection efficiency of volumetric gamma sources' reference samples in the form of a metal cylinder, a rod, and a rod placed in a 200-L barrel with sand, in the energy range of 50-1500 keV, has been simulated. Comparison of simulation results with in-situ measurements by a mobile HPGe spectrometer showed that the discrepancy between calculation and experiment for all measurement geometries is larger for EffMaker, which is associated with a less accurate detector model than in MCC-MT. Both programs give acceptable results in terms of accuracy and are recommended for calibrating gamma spectrometers in the case of field measurements.